You probably trained the system instead of re-training it. Re-training updates only Z12.par. Full training updates all parameter files, but does not make sense because the WFO periods are fixed. So it will take a long time and you'll end up with the same files as before.

For re-training a system, just click [Train] while it is trading. This is not necessary for Z12, though, as we'll provide anyway new parameter files with any Zorro update.